Spillway liner and method
A liner is formed in an excavated spillway by providing a plurality of rectangular flexible liner sections with each liner section having a parallel series of elongated continuous and adjacent tubular pockets pre-filled with a dry cementitious material or a fine granular material. The liner sections are provided with a surrounding generally flat perimeter boarder. The liner sections are laid into the spillway with their boarders overlapping and the boarders are secured together with the tubular pockets aligned in the same direction to form a continuous liner blanketing the spillway. The tubular pockets are arranged in the spillway with their elongated sides presented to the expected direction of water flow in the spillway. The liner sections may be anchored to the spillway with anchor pins.
1 . A method of forming a spillway liner comprising:
providing a plurality of rectangular flexible liner sections, each having a parallel series of elongated continuous and adjacent tubular pockets containing a dry cementitious material or a fine granular material and having a surrounding generally flat perimeter border;
laying a plurality of said liner sections in a spillway with said borders thereof overlapping and securing said borders together with said tubular pockets aligned in the same direction to form a continuous liner blanketing at least a portion of said spillway;
said tubular pockets arranged in the spillway with their elongated sides presented to the expected direction of water flow in said spillway.
2 . The method of claim 1 , said liner sections provided with an upper sheet surface which is water permeable, and filling said tubular pockets with dry cementitious material and saturating said liner sections with water after being laid to cure said cementitious material.
3 . The method of claim 1 , securing said liner sections to the spillway with anchor pins.
4 . A spillway liner for erosion control in spillways and ditches, comprising:
a plurality of rectangular flexible liner sections, each having a parallel series of elongated continuous and adjacent tubular pockets and a surrounding generally flat perimeter border;
said pockets having closable access fill openings along one edge of each liner section;
said pockets filled with dry cementitious material or fine granular material;
said liner sections arranged in a spillway with adjacent of said borders overlapping and secured together with said tubular pockets aligned in the same direction to form a continuous liner blanketing at least a portion of said spillway with the elongated sides of said filled pockets presented to the expected direction of water flow in said spillway.
5 . The spillway liner of claim 4 , said liner sections having an upper water permeable sheet and said pockets filled with cementitious material.
6 . The spillway liner of claim 5 , said liner sections having a bottom sheet which is non-permeable to water.
7 . The spillway liner of claim 4 , said overlapping borders having aligned grommets for securing the liner sections to said spillway with anchor pins.
8 . The spillway liner of claim 4 , said overlapping borders secured together with hook and loop fasteners.